Robina Li

There is a dungeon with n x m rooms arranged as a grid.

There is a dungeon with n x m rooms arranged as a grid.

A message containing letters from A-Z can be encoded into numbers using the following mapping:

There are n people standing in a queue numbered from 0 to n - 1 from left to right. You are given an array heights of distinct integers where heights[i]...

There exists an undirected tree with n nodes numbered 0 to n-1. You are given a 2D integer array edges of length n-1, where edges[i] = [ui, vi, lengthi] indicates...

You have numCourses courses labeled from 0 to numCourses - 1. You are given an array prerequisites where prerequisites[i] = [ai, bi] means you must take course bi before course...

You have infinitely many lakes, all initially empty. When it rains on lake n, that lake becomes full. If it rains on a lake that is already full, a flood...

Koko has n piles of bananas; the i-th pile has piles[i] bananas. The guards return in h hours. Koko can choose an integer eating speed k (bananas per hour). Each...

Given an array of integers nums and an integer k, return the number of unique k-diff pairs in the array.

You are given an integer eventTime (the event runs from time 0 to eventTime) and two arrays startTime and endTime representing n non-overlapping meetings. You may reschedule at most k...